[petsc-users] Does float128 helps ksp solver convergence

[Gong Ding]

Hi,
I always meed some linear system with condition number near 1e10, the ksp solver (BCGSL + ASM + ILU(1))with double presision
seems painful to convergence.

Will float 128 helps in this situation? 
And how about the performance degenerate for float 128 under i.e. XEON 5620 CPU compared with double?

Thanks
Gong Ding